Doc Brown's Edexcel GCSE Science-Chemistry Revision Notes

EDEXCEL GCSE Additional Science GCSE Chemistry Unit C2 Discovering chemistry STUDY NOTES

Chemistry Unit C2 Topic 5 Chemical reactions Revision Notes

• 5.1 Measure temperature changes accompanying some of the following types of change:
  • a) salts dissolving in water
  • b) neutralisation reactions
  • c) displacement reactions
  • d) precipitation reactions
• 5.2 Define an exothermic change or reaction as one in which heat energy is given out, including combustion reactions or explosions.
• 5.3 Define an endothermic change or reaction as one in which heat energy is taken in, including photosynthesis or dissolving ammonium nitrate in water.
• 5.4 Be able to describe the breaking of bonds as endothermic and the making of bonds as exothermic.
• 5.5 Be able to demonstrate an understanding that the overall heat energy change for a reaction is:
  • a) exothermic if more heat energy is released making bonds in the products than is required to break bonds in the reactants
  • b) endothermic if less heat energy is released making bonds in the products than is required to break bonds in the reactants
• 5.6 HT only: Be able to draw and interpret simple graphical representations of energy changes occurring in chemical reactions (no knowledge of activation energy is required).
• 5.7 Revise the investigation on the effect of temperature, concentration and surface area of a solid on the rate of a reaction such as hydrochloric acid and marble chips.
• 5.8 Know that the rates of chemical reactions vary from very fast, explosive reactions to very slow reactions.
• 5.9 Be able to describe the effect of changes in temperature, concentration and surface area of a solid on the rate of reaction.
• 5.10 Be able to describe how reactions can occur when particles collide and (HT only) explain how rates of reaction are increased by increasing the frequency and/or energy of collisions.
• 5.11 HT only: Be able to demonstrate an understanding that not all collisions lead to a reaction, especially if particles collide with low energy.
• 5.12 Know the effect of a catalyst on the rate of reaction.
• 5.13 Be able to demonstrate an understanding that catalytic converters in cars:
  • a) have a high surface area to increase the rate of reaction of carbon monoxide and unburnt fuel from exhaust gases with oxygen from the air to produce carbon dioxide and water
  • b) work best at high temperatures

• Revision Notes and Quizzes to help you revise

  • Edexcel GCSE Additional Science Chemistry

  • When revising, these pages provide you with a summary of what you need to know and be able to do.

  • BUT remember, your primary source of revision are your class notes, investigations and Edexcel GCSE science textbooks.

  • Notes on Energy changes-transfers in Chemical Reactions - Exothermic and endothermic energy changes,

    • Multiple choice quiz on Energy Changes in Chemical Reactions

  • NOTES on factors affecting the rates-speeds of chemical reactions

    • Multiple choice Quiz on the Rates of Chemical Reactions

    • Crossword on Rates of Reactions * Answers

    • Wordfill worksheet on Rates of Chemical Reactions

    • (1) and (2) matching pair quizzes on Rates of Chemical Reactions

    • Extra Industrial Chemistry Notes on uses of enzymes

• EDEXCEL GCSE Additional Science CHEMISTRY 2 UNIT 2 C2 Discovering chemistry INDEX

  • Chemistry Unit C2 Topic 1 Atomic structure and the periodic table

  • Chemistry Unit C2 Topic 2 Ionic compounds and analysis

  • Chemistry Unit C2 Topic 3 Covalent compounds and separation techniques

  • Chemistry Unit C2 Topic 4 Groups in the periodic table

  • Chemistry Unit C2 Topic 5 Chemical reactions

  • Chemistry Unit C2 Topic 6 Quantitative chemistry

• ALL Edexcel GCSE Science Units: Edexcel GCSE Science Biology Unit B1 Influences on life

• Edexcel GCSE Science Biology Unit B2 The components of life  *  Edexcel GCSE Science Unit B3 Using biology

• Edexcel GCSE Science Unit C1 Chemistry in our world * Edexcel GCSE Science Unit C2 Discovering Chemistry

• Edexcel GCSE Science Unit C3 Chemistry in action * Edexcel GCSE Science Unit P1 Universal Physics

• Edexcel GCSE Science Unit P2 Physics for your future * Edexcel GCSE Science Unit P3 Applications of Physics

• GCSE Science-Chemistry courses AQA GCSE Science A CHEMISTRY *  EDEXCEL GCSE Science CHEMISTRY

• OCR GCSE 21st Century Science A CHEMISTRY  *  OCR GCSE Gateway Science B CHEMISTRY

• WJEC GCSE Science-CHEMISTRY  *  Northern Ireland CCEA GCSE Science-CHEMISTRY

• ** Doc Brown's Edexcel GCSE Chemistry Revision

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